The number of calories you naturally burn in a day-often called your basal metabolic rate (BMR) or resting metabolic rate (RMR)-depends on factors such as your age, sex, height, weight, and muscle mass. This reflects the calories your body uses to maintain basic functions like breathing, circulation, and cell repair without any additional physical activity.

Typical Calorie Burn Ranges

• For adult men: The natural calorie burn typically ranges from about 1,600 to 1,800 calories per day at rest (BMR), and total daily calorie needs including normal activities range approximately from 2,000 to 3,000 calories depending on activity level and other factors

• For adult women: The natural calorie burn at rest is usually between 1,400 and 1,500 calories per day, with total daily calorie needs ranging roughly from 1,600 to 2,200 calories depending on activity and body characteristics

How It Works

• Your BMR accounts for about 60% to 70% of the total calories you burn in a day, with the rest coming from physical activity and the thermic effect of food (calories burned digesting food)

• On average, a person burns about 1 calorie per minute just by existing, so even sedentary activities like reading or sleeping burn calories continuously

Estimating Your BMR

A common formula to estimate BMR is:

• For men: 9.99×weight (kg)+6.25×height (cm)−4.92×age+59.99\times \text{weight (kg)}+6.25\times \text{height (cm)}-4.92\times \text{age}+59.99×weight (kg)+6.25×height (cm)−4.92×age+5
• For women: 9.99×weight (kg)+6.25×height (cm)−4.92×age−1619.99\times \text{weight (kg)}+6.25\times \text{height (cm)}-4.92\times \text{age}-1619.99×weight (kg)+6.25×height (cm)−4.92×age−161

This gives you the approximate number of calories burned at rest per day

Summary

• Men generally burn about 2,000 to 3,000 calories daily including normal activity.
• Women generally burn about 1,600 to 2,200 calories daily including normal activity.
• At complete rest (BMR), men burn around 1,600-1,800 calories/day, women about 1,400-1,500 calories/day.
• Physical activity and other factors increase total daily calorie burn beyond the BMR.

These numbers vary widely based on individual characteristics and lifestyle